Expansion shield



May 27 1924.

J. E. OGDEN EXPANSION SHIELD Filed'Cr.. 2l. 19121- 2 Sheets-Sheet l n., ,m 00V u M%A.

a f J; y,

Patented May Z7, 1924.

JOHN EDWARD OGDEN, OF MOUN '1fAINVILLE,A NEW YORK.

provements in ExpansionV Shields, of which' the following is a specification.

This invention-relates to bolt anchors and more particularly to expansion shields for bolt anchors and to the manufacture of such devices. l

One of the objects of the invention is to provide a simple and inexpensive device of the character described which may be effectively used to hold a bolt or screw in material such as stone,- brick or cementitious material with which the threaded element can not directly obtain a secure hold.

Another object of the invention 'is to provide an expansion shield which maybe readily manufactured.

Another object ofthe invention is to provide a simple and inexpensive method'for manufacturing expansionY shields.

Furtherobjects of the invention willV appear from the following specification taken ineonnection with the drawings whichform a partof this application and'in which,

Fig. l is anl elevation of yan expansion shield constructed in accordanceV with my invention. Y f

Fig. 2 is an elevation ofl one of the sections of the expansion shield shown in Fig.1. Y f

Fig. 3 isl an end elevation of the outer end of the shield shown in Fig. 1.y

Figs. 4; 5 and 6 aretransverse sectional views taken'substantially on lines 4 4, 5-5 and 6-6 of Fig. l. j

Fig. 7 is anend elevation ofthe inner end of the shield. shown in Fig. 1. l

Fig. 8 is a sectional elevation of a shield similar to that shown in Fig. 1 but in which the shieldsections are secured together by lugs carried by each section.

Fig. 9'is a plan view of the blank from which one of the' shield sections is formed.

'-Fig. 10 is a. similar view of shield section blank, and

Fig. 11 is a plan view of a modified form of blank from which the shield shown in transverse section in Fig. 8 may be formed. 'The invention may be vbriefly described as a shield comprising a pluralit of-sections vfolded transversely and securedgtogether tov the other' shield.

EXPANsroN SHIELD.

Application mea october 21, 1921/. serial No. 509,360.

form a tube having opposite parts depressed.-

or tapered to constrict thebore of the tube toward the inner end. The metall at the edges of the shield sections is folded in` such a manner as to provide an excess of metal at the outer surface of the constricted portion.

of the tube. In the particular embodiment of the invention shown the cross section of the tube varies from a circle at the outer end to a flattened curve or oval at the inner end. Also as particularly illustrated the folds do not extend throughout the entire length of I the shield and are double for a portion of Atheir length and are single for another portion of their length. Further and more detailed features of the invention will be ex plained in the description of the particularV structure shown in the drawings. y

Like characters of reference designate corresponding parts throughout theseveral views of the drawings.

Referring iirst to Figs. 9 andlO the shield may be formed from a pair of blanks 2O and 2l adapted to be secured together by lugs 22 shown as vforined on the blank 20. The blank 2l is illustrated as having depressed portions 23 for receiving the lugs 22. If desired, however, each blank, as

, shown inFig. 1l, may have a lug 22 and a depression 23 instead of both lugs being formed on one blank and both'depressionsY being formed in the other blank.

Each blank has also formed thereon for a short portion of its length adjacent the outer end end an outwardly projecting rib 24 formed by crimping the metal at this point. .These ribs in the completed shield assist in preventing the rotation of the shield Vin the opening in which the shield is positioned when the threaded member is being inserted'in the shield. For a portion ofI its length at the outer end each blank has substantially parallel edges 25. The edges beyond the parallel portions 25 are tapered as `shown at 26 to provide an excess of metal` as hereinafter described and the end'v portions of the blanks are also tapered as shown` at 2 7, this portion 27 constituting the outer portion when the blank has been folded. transversely and the two complementary blanks havebe'en combined to form the f tapered portions 27 lare incline with red'- Vof the opposite blanks.

spect to the longitudinal axis of the blank at the saine angle as are the edges of the tapered portions 26. ln other Words, the edges of the portions 27 if extended would be parallel to the edges of the portions 26.

The blanks 20 and 2l are corrugated as shown at 2S and 29, transversely of the blanks, and these corrugations of the tivo blanks aie complementary so that, when the blanks are folded and combined, they form the threads for receiving the bolt oi threaded member which is inserted in the shield.

The blanks shon'n in Figs. 9 and l() are folded transversely about longitudinal axes and are secured together forming the shields' in Fig. l. As the blanks are folded, the substantially parallel portions 25 f the side edges are slightly flanged or turned outwardly as shown at 30 and the tube formed by the joined sections is internally tapered as shown in Fig. 2 by depressing the metal i ,t will be noted that the form of the tubular shield changes from substantially a circle at the outer end to a flattened curve or oval at the inner end, the two ends being shown respectively in Figs. 3 and 7.

The tapered portions 26 and 27 of the blanks were designed to provide an excess of metal adjacent the flattened portions of the tube. This is accomplished by folding the tapered portions 26 and 27 outwardlyv on a plane disposed substantially at right angles to the major axis of the flattened curve or oval portion of the bore or, in other Words, these portions aie folded outwardly along the lines forming continuations ofthe lines of division between the shield sections. rlhe portions 26 and 27 are then folded back toward or upon the outer flattened surfaces of the sections and the portions 27 are again folded back upon themselves until their edges meet. The portions 26 therefore form single folds on the outer surfaces of the shield sections and the portions 27 form double folds. By reason of the tapering form of the edge portions 26 and 2T, the folds are tapered longitudinally and, as shown in Fig. 2, the portions 27, when folded, form tapered longitudinal chambers. By means of these folds on the outer constricted portions of the shield the substantially cylindrical form of the shield is maintained throughout its length. It will be understood of course,

- that as the threaded element is inserted in vthe shield the constricted portion is forced Voutwardly by this element and the excess of metal formed by the folds is pressed intoV firm engagement With the Wall of the opening in Ywhich the shield is positioned. o

From the above description it will be seen that a simple and practical expansion shield has been designed and that this shield may be readily manufactured. Furthermore the shield is so constructed that in use it will firmly and securely engage the opening in which it is positioned.

Although one specific embodiment of thc invention has been illustrated and described. it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made Without departing from the spirit or scope of the invention as expressed in the following claims.

What l claim is l. An expansion shield comprising a tubular member formed from a plurality of Vsections and having a bore tapered toward the inner end and having oppositely tapering longitudinally extending folds on its outer surface, formed by folding the metal, at the longitudinal edges of the sections, back upon itself, the folds at the inner. more constricted. portion of the shield being double and at the less constricted portion being single.

2. An expansion shield comprising a plus ralityof sections secured together to form a tubular member, the metal at the edges of the sections being folded back upon itself Vto provide an excess of metal on the outer surface, the folds adjacent the inner end of theF shield being double and toward the other end being single.

3. An expansionshield comprising a plurality of sections secured together to form a tubular shield, the metal at the edges of said sections being bent outwardly'for a portion of the length of the shield, being bent over the outer surface of the sections for another longitudinal portion and being doubled back over itself for a third portion.

4. An expansion shield comprising a plurality of sections constricted toward one end and secured togetherY to forma tapered tubular shield. the metal at the edges of said sections being bent outwardly for a portion of the length of the shield, being bent over the outer surface of the sections for another longitudinal portion and being doubled back over itself for a third portion.

5. An expansion shield comprising a plurality of sections constricted toward one yend and secured together to form a tapered, tubular shield, the metal at the edges of said sections being bent outwardly for a portion of the length of the shield, being bent over the outer surface of the sections for another longitudinal portion and being doubled back over itself until the edges Ameet for a third portion.

6. A sheet metal expansion shield having more metal at one end than at the other, comprising a plurality of sections folded transversely and secured together to form Va tube with the outer portions of greatest lll@ lill@ diameter lying in substantially the same cylinder', and with opposite parts increasingly depressed to form a bore varying from a substantially circular cross section to a flattened curve, and with parts adjacent the depressions folded back on the outer surface of the shield and doubled back on itself to form three thicknesses of metal at the more constricted portion of the bore.

7. A sheet metal expansion shield coinprising a tubular body formed from a plurality of sections secured together, and having a tapered opening, each of the sections having at each longitudinal edge longitudinal folds of a double thickness of metal adapted to be pressed into the Walls of an opening when the shield is expanded therein.

8. A sheet metal blank for an expansion shield having substantially parallel side edges for a portion of its length, having its side edges flared for another portion of its length and having a second flared portion of greater Width than the maximum Width of the first flared portion. for a third portion of the length of the shield.

9. A sheet metal blank for an expansion shield having substantially parallel side edges for a portion of its length, having its side edges flared for another portion of its length and having'a second flared portion for a third portion of its length, the mean Width of the second flared portion being greater than the mean Width of the first flared portion.

10. A sheet metal blank for an expansion shield having substantially parallel side edges for a portion of its length, having its side edges flared for another portion of its length and having a second flared portion, the edges of the second flared portion being inclined at'the same angle with respect to the longitudinal axis of the shield as the edges of the first flared portion.

In Witness whereof, I have hereunto set my hand this 19th day of October, 192]..

JOHN EDVARD OGDEN. 

